191010109103 has 12 divisors (see below), whose sum is σ = 221003434680. Its totient is φ = 164506312080.

The previous prime is 191010109091. The next prime is 191010109159. The reversal of 191010109103 is 301901010191.

It is a happy number.

It is not a de Polignac number, because 191010109103 - 2¹² = 191010105007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191010109163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41539700 + ... + 41544297.

It is an arithmetic number, because the mean of its divisors is an integer number (18416952890).

Almost surely, 2^191010109103 is an apocalyptic number.

191010109103 is a deficient number, since it is larger than the sum of its proper divisors (29993325577).

191010109103 is a wasteful number, since it uses less digits than its factorization.

191010109103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83084038 (or 83084027 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 26.

Adding to 191010109103 its reverse (301901010191), we get a palindrome (492911119294).

The spelling of 191010109103 in words is "one hundred ninety-one billion, ten million, one hundred nine thousand, one hundred three".